What are the common reasons for the Audi A2's check engine light to turn on?

I recently noticed that the check engine light on my Audi A2 turned on. I am not sure why it happened and what should I do. Any advice?

Firstly, don't panic. Check engine light can be triggered by a variety of reasons. It could be a minor issue like a loose gas cap or something more serious like a faulty oxygen sensor. The best thing to do is to take your Audi A2 to a certified mechanic for a diagnostic scan. This will give you a better understanding of the problem.